https://docs.python.org/3/library/threading.html#threading.Condition
https://stackoverflow.com/questions/17774768/python-creating-a-shared-variable-between-threads
import threading
import time
c = threading.Condition()
flag = 0 #shared between Thread_A and Thread_B
val = 20
class Thread_A(threading.Thread):
def init(self, name):
threading.Thread.init(self)
self.name = name
def run(self):
global flag
global val #made global here
while True:
c.acquire()
if flag == 0:
print "A: val=" + str(val)
time.sleep(0.1)
flag = 1
val = 30
c.notify_all()
else:
c.wait()
c.release()
class Thread_B(threading.Thread):
def init(self, name):
threading.Thread.init(self)
self.name = name
def run(self):
global flag
global val #made global here
while True:
c.acquire()
if flag == 1:
print "B: val=" + str(val)
time.sleep(0.5)
flag = 0
val = 20
c.notify_all()
else:
c.wait()
c.release()
a = Thread_A("myThread_name_A")
b = Thread_B("myThread_name_B")
b.start()
a.start()
a.join()
b.join()
